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Tempura ko-ayu sweetfish do not grow as large as the ayu sweetfish which grow big in rivers. Ko-ayu remain in the lake and feed on plankton. Such an environment prevents them from getting larger. Keywords: shiga kusatsu karasuma peninsula lake biwa museum aquarium fish endemic species

Tempura ko-ayu sweetfish do not grow as large as the ayu sweetfish which grow big in rivers. Ko-ayu remain in the lake and feed on plankton. Such an environment prevents them from getting larger.

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